Experimental and Numerical Studies on the Seismic Performance of Joints Between Steel Beams and Concrete-Filled Steel Tubular Flat Columns

IF 1.9 Earthquake Engineering and Resilience Pub Date : 2025-09-30 DOI:10.1002/eer2.70022

Wanyu Shen, Hanqin Wang, Qing Jiang, Pengfei Tian

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Abstract

To optimize the connection between the beam and the concrete-filled steel tubular flat column (CFSTFC), a new connection using the vertical internal plates as stiffeners was proposed. In this paper, the seismic performance of the joint in the center column was studied by the quasi-static test of two middle joint specimens with 10-mm-thick and 14-mm-thick steel tubes. The failure of the joint was concentrated in the beams, and the CFSTFC remained elastic. The tested joint showed good seismic performance. Changing the thickness of a steel tube has little influence on the stiffness, strength, and ductility of the rigid joint. Then, the influence of the axial compression ratio on the seismic performance of the joint was investigated by finite element analysis. With the axial force increasing, the seismic performance of the joint gradually decreased. Finally, a simplified fiber element model of the joint was proposed and validated by the test and solid element model results.

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钢管混凝土扁柱与钢梁节点抗震性能的试验与数值研究

为了优化钢管混凝土扁柱与梁的连接方式，提出了一种以竖向内板为加强筋的新型连接方式。本文通过10 mm厚和14 mm厚钢管两个中间节点试件的准静力试验，对中心柱节点的抗震性能进行了研究。节点破坏集中在梁上，CFSTFC保持弹性。试验节点具有良好的抗震性能。改变钢管的厚度对刚性节点的刚度、强度和延性影响不大。然后，通过有限元分析研究了轴压比对节点抗震性能的影响。随着轴力的增大，节点的抗震性能逐渐降低。最后，提出了一种简化的关节纤维单元模型，并通过试验和实体单元模型结果进行了验证。

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Earthquake Engineering and Resilience

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